refactor(file): changed way read and write works and temporary removed some tests

.gitignore

@@ -65,5 +65,7 @@ compile_commands.json
 CTestTestfile.cmake
 _deps
 CMakeUserPresets.json
-
 build
+
+# clangd
+.cache/

CMakeLists.txt

@@ -11,10 +11,11 @@ target_include_directories(cosms-core PUBLIC ${PROJECT_SOURCE_DIR}/include)
 if (MSVC)
 	target_compile_options(cosms-core PRIVATE /W4)
 else()
-	target_compile_options(cosms-core PRIVATE -wall -Wextra -pedantic)
+    target_compile_options(cosms-core PRIVATE -Wall -Wextra -pedantic)
 endif()
 
-add_executable(cosms-core-test ${PROJECT_SOURCE_DIR}/tests/main.c)
+file(GLOB_RECURSE SRC_TEST_FILES "${PROJECT_SOURCE_DIR}/tests/*.c")
+add_executable(cosms-core-test ${SRC_TEST_FILES})
 
 target_include_directories(cosms-core-test PRIVATE ${PROJECT_SOURCE_DIR}/tests)
 target_link_libraries(cosms-core-test cosms-core)

include/cosms-core/file.h

@@ -1,7 +1,63 @@
+/*
+ * Copyright (C) Tristan Franssen, <tristanfranssen@strawhats.nl>.
+ *
+ * This software is licensed under the Apache License, Version 2.0 (the "License");
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License in the file LICENSE or at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ */
 #ifndef COSMS_CORE_FILE
 #define COSMS_CORE_FILE
 
-void cosms_core_file_read(char *path);
+#if defined(_WIN32)
-void cosms_core_file_write(char *path);
+#include <windows.h>
+#endif
+
+typedef enum {
+    COSMS_CORE_FILE_OK = 0,
+    COSMS_CORE_FILE_NOT_FOUND = -1,
+    COSMS_CORE_FILE_NO_ACCESS = -2,
+    COSMS_CORE_FILE_LIMIT_REACHED = -3,
+    COSMS_CORE_FILE_COULD_NOT_READ_SIZE = -4,
+    COSMS_CORE_FILE_UNKOWN_ERROR = -5,
+    COSMS_CORE_FILE_FAILED_TO_ALLOCATE = -6,
+    COSMS_CORE_FILE_FAILED_TO_READ = -7,
+    COSMS_CORE_FILE_FAILED_TO_WRITE = -8,
+    COSMS_CORE_FILE_STILL_OPEN = -9,
+    COSMS_CORE_FILE_INVALID_FILE = -10,
+    COSMS_CORE_FILE_INVALID_OPERATION = -11
+} CosmsCoreFileError;
+
+#define COSMS_CORE_FILE_LARGE 0x7FFFFFFF
+
+#define COSMS_CORE_FILE_MODE_READ (1u << 0)
+#define COSMS_CORE_FILE_MODE_WRITE (1u << 1)
+#define COSMS_CORE_FILE_MODE_APPEND (1u << 2)
+#define COSMS_CORE_FILE_MODE_CREATE (1u << 3)
+
+struct cosms_core_file {
+    int mode;
+
+    #if defined(__GNUC__)
+    int native_file;
+    #elif defined(_WIN32)
+    HANDLE native_file;
+    #endif
+};
+
+CosmsCoreFileError cosms_core_file_open(struct cosms_core_file *file, const char *path, int mode);
+CosmsCoreFileError cosms_core_file_close(struct cosms_core_file *file);
+
+CosmsCoreFileError cosms_core_file_get_size(struct cosms_core_file *file, unsigned long long *size);
+
+CosmsCoreFileError cosms_core_file_read(struct cosms_core_file *file, char **buffer, unsigned int bytes_to_read, unsigned int *bytes_read);
+CosmsCoreFileError cosms_core_file_read_all(struct cosms_core_file *file, char **buffer, unsigned long long *bytes_read);
+
+CosmsCoreFileError cosms_core_file_write(struct cosms_core_file *file, char *buffer, unsigned int bytes_to_write, unsigned int *bytes_written);
+CosmsCoreFileError cosms_core_file_write_all(struct cosms_core_file *file, char *buffer, unsigned long long bytes_to_write);
+
+CosmsCoreFileError cosms_core_file_delete(const char *path);
+
+const char *cosms_core_file_error_string(CosmsCoreFileError error);
 
 #endif

src/file.c

@@ -1,11 +1,417 @@
-#include <cosms-core/file.h>
+/*
+ * Copyright (C) Tristan Franssen, <tristanfranssen@strawhats.nl>.
+ *
+ * This software is licensed under the Apache License, Version 2.0 (the "License");
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License in the file LICENSE or at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ */
+#include "cosms-core/file.h"
 
-#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <limits.h>
 
-void cosms_core_file_read(char *path) {
+#if defined(__GNUC__)
-	printf("Hello, World!");
+#define _FILE_OFFSET_BITS_ 64
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <errno.h>
+#endif
+
+CosmsCoreFileError cosms_core_file_open(struct cosms_core_file *file, const char *path, int mode) {
+    file->mode = mode;
+
+    #if defined(__GNUC__)
+    int flags = 0;
+    if (mode & (COSMS_CORE_FILE_MODE_READ | COSMS_CORE_FILE_MODE_WRITE)) {
+        flags |= O_RDWR;
+    } else if (mode & COSMS_CORE_FILE_MODE_READ) {
+        flags |= O_RDONLY;
+    } else if (mode & COSMS_CORE_FILE_MODE_WRITE) {
+        flags |= (O_WRONLY | O_TRUNC);
+    } else if (mode & COSMS_CORE_FILE_MODE_APPEND) {
+        flags |= (O_WRONLY | O_APPEND);
     }
 
-void cosms_core_file_write(char *path) {
+    if (mode & COSMS_CORE_FILE_MODE_CREATE) {
-	printf("Hello, World");
+        flags |= O_CREAT;
+    }
+
+    struct stat file_stat;
+    if (stat(path, &file_stat) != 0) {
+        return COSMS_CORE_FILE_COULD_NOT_READ_SIZE;
+    }
+
+    if (file_stat.st_size > COSMS_CORE_FILE_LARGE) {
+        flags |= O_LARGEFILE;
+    }
+
+    file->native_file = open(path, flags);
+    if (file->native_file == -1) {
+        switch(errno) {
+            case ENOENT: 
+                return COSMS_CORE_FILE_NOT_FOUND;
+
+            case EACCES:
+                return COSMS_CORE_FILE_NO_ACCESS;
+
+            case EMFILE:
+            case ENFILE:
+                return COSMS_CORE_FILE_LIMIT_REACHED;
+
+            default:
+                return COSMS_CORE_FILE_UNKOWN_ERROR;
+        }
+    }
+    #elif defined(_WIN32)
+    DWORD access_flags = 0;
+    DWORD create_flag = OPEN_EXISTING;
+
+    if (mode & COSMS_CORE_FILE_MODE_READ) {
+        access_flags |= GENERIC_READ;
+    } 
+    
+    if (mode & COSMS_CORE_FILE_MODE_WRITE) {
+        access_flags |= GENERIC_WRITE;
+    }
+
+    if (mode & COSMS_CORE_FILE_MODE_APPEND) {
+        access_flags |= GENERIC_WRITE;
+        create_flag = OPEN_ALWAYS;
+    }
+
+    if (mode & COSMS_CORE_FILE_MODE_CREATE) {
+        create_flag = CREATE_ALWAYS;
+    }
+
+    file->native_file = CreateFile(path, access_flags, 0, NULL, create_flag, FILE_ATTRIBUTE_NORMAL, NULL);
+    if (file->native_file == INVALID_HANDLE_VALUE) {
+        switch(GetLastError()) {
+            case ERROR_FILE_NOT_FOUND:
+            case ERROR_PATH_NOT_FOUND:
+                return COSMS_CORE_FILE_NOT_FOUND;
+
+            case ERROR_ACCESS_DENIED:
+            case ERROR_SHARING_VIOLATION:
+            case ERROR_LOCK_VIOLATION:
+                return COSMS_CORE_FILE_NO_ACCESS;
+
+            case ERROR_TOO_MANY_OPEN_FILES:
+                return COSMS_CORE_FILE_LIMIT_REACHED;
+
+            default:
+                return COSMS_CORE_FILE_UNKOWN_ERROR;
+        }
+    }
+    #endif
+
+    return COSMS_CORE_FILE_OK;
+}
+
+CosmsCoreFileError cosms_core_file_close(struct cosms_core_file *file) {
+    #if defined(__GNUC__)
+    int error = close(file->native_file);
+    if (error == -1) {
+        if (errno == EBADF) {
+            return COSMS_CORE_FILE_INVALID_FILE;
+        }
+
+        return COSMS_CORE_FILE_UNKOWN_ERROR;
+    }
+    #elif defined(_WIN32)
+    BOOL error = CloseHandle(file->native_file);
+    if (error == 0) {
+        if (GetLastError() == ERROR_INVALID_HANDLE) {
+            return COSMS_CORE_FILE_INVALID_FILE;
+        }
+
+        return COSMS_CORE_FILE_UNKOWN_ERROR;
+    }
+    #endif
+
+    return COSMS_CORE_FILE_OK;
+}
+
+CosmsCoreFileError cosms_core_file_get_size(struct cosms_core_file *file, unsigned long long *size) {
+    #if defined(__GNUC__)
+    struct stat file_stat;
+    if (fstat(file->native_file, &file_stat) != 0) {
+        if (errno == EBADF) {
+            return COSMS_CORE_FILE_INVALID_FILE;
+        }
+
+        return COSMS_CORE_FILE_COULD_NOT_READ_SIZE;
+    }
+
+    (*size) = file_stat.st_size;
+    #elif defined(_WIN32)
+    DWORD high_size;
+    DWORD low_size = GetFileSize(file->native_file, &high_size);
+    if (low_size == INVALID_FILE_SIZE) {
+        if (GetLastError() == ERROR_INVALID_HANDLE) {
+            return COSMS_CORE_FILE_INVALID_FILE;
+        }
+
+        return COSMS_CORE_FILE_COULD_NOT_READ_SIZE;
+    }
+
+    (*size) = ((unsigned long long)high_size << 32) | low_size;
+    #endif
+
+    return COSMS_CORE_FILE_OK;
+}
+
+CosmsCoreFileError cosms_core_file_read(struct cosms_core_file *file, char **buffer, unsigned int bytes_to_read, unsigned int *bytes_read) {
+    if ((file->mode & COSMS_CORE_FILE_MODE_READ) == 0) {
+        return COSMS_CORE_FILE_INVALID_OPERATION;
+    }
+
+    #if defined(__GNUC__)
+    int read_bytes = read(file->native_file, *buffer, bytes_to_read);
+    if (read_bytes == -1) {
+        return COSMS_CORE_FILE_FAILED_TO_READ;
+    }
+
+    if (bytes_read != NULL) {
+        (*bytes_read) = read_bytes;
+    }
+    #elif defined(_WIN32)
+    if (ReadFile(file->native_file, *buffer, bytes_to_read, (LPDWORD)bytes_read, NULL) == 0) {
+        return COSMS_CORE_FILE_FAILED_TO_READ;
+    }
+    #endif
+
+    buffer[bytes_to_read] = '\0';
+    return COSMS_CORE_FILE_OK;
+}
+
+CosmsCoreFileError cosms_core_file_read_all(struct cosms_core_file *file, char **buffer, unsigned long long *bytes_read) {
+    if ((file->mode & COSMS_CORE_FILE_MODE_READ) == 0) {
+        return COSMS_CORE_FILE_INVALID_OPERATION;
+    }
+
+    #if defined(__GNUC__)
+    struct stat file_stat;
+    if (fstat(file->native_file, &file_stat) != 0) {
+        return COSMS_CORE_FILE_COULD_NOT_READ_SIZE;
+    }
+
+    if (bytes_read != NULL) {
+        (*bytes_read) = file_stat.st_size;
+    }
+
+    (*buffer) = (char*)malloc((file_stat.st_size + 1) * sizeof(char));
+    if ((*buffer) == NULL) {
+        return COSMS_CORE_FILE_FAILED_TO_ALLOCATE;
+    }
+
+    unsigned long long remaining_bytes = file_stat.st_size;
+    while (remaining_bytes != 0) {
+        unsigned int current_bytes_to_read;
+        if (remaining_bytes > UINT_MAX) {
+            current_bytes_to_read = UINT_MAX;
+        } else {
+            current_bytes_to_read = (unsigned int)remaining_bytes;
+        }
+
+        int read_bytes = read(file, (*buffer) + (file_stat.st_size - remaining_bytes), current_bytes_to_read);
+        if (read_bytes == -1) {
+            free(*buffer);
+            return COSMS_CORE_FILE_FAILED_TO_READ;
+        }
+
+        remaining_bytes -= read_bytes;
+    }
+
+    (*buffer)[file_stat.st_size] = '\0';
+    #elif defined(_WIN32)
+    DWORD high_size;
+    DWORD low_size = GetFileSize(file->native_file, &high_size);
+    if (low_size == INVALID_FILE_SIZE && GetLastError() != NO_ERROR) {
+        return COSMS_CORE_FILE_COULD_NOT_READ_SIZE;
+    }
+
+    unsigned long long file_size = ((unsigned long long)high_size << 32) | low_size;
+    if (bytes_read != NULL) {
+        (*bytes_read) = file_size;
+    }
+
+    (*buffer) = (char*)malloc((file_size + 1) * sizeof(char));
+    if ((*buffer) == NULL) {
+        return COSMS_CORE_FILE_FAILED_TO_ALLOCATE;
+    }
+
+    unsigned long long remaining_bytes = file_size;
+    while (remaining_bytes != 0) {
+        DWORD current_bytes_to_read, read_bytes;
+        if (remaining_bytes > UINT_MAX) {
+            current_bytes_to_read = UINT_MAX;
+        } else {
+            current_bytes_to_read = (DWORD)remaining_bytes;
+        }
+
+        if (ReadFile(file->native_file, (*buffer) + (file_size - remaining_bytes), current_bytes_to_read, &read_bytes, NULL) == 0) {
+            free(*buffer);
+            return COSMS_CORE_FILE_FAILED_TO_READ;
+        }
+
+        remaining_bytes -= read_bytes;
+    }
+
+    (*buffer)[file_size] = '\0';
+    #endif
+    
+    return COSMS_CORE_FILE_OK;
+}
+
+CosmsCoreFileError cosms_core_file_write(struct cosms_core_file *file, char *buffer, unsigned int bytes_to_write, unsigned int *bytes_written) {
+    if ((file->mode & COSMS_CORE_FILE_MODE_WRITE) == 0) {
+        return COSMS_CORE_FILE_INVALID_OPERATION;
+    }
+
+    #if defined(__GNUC__)
+    int written_bytes = write(file->native_file, buffer, bytes_to_write);
+    if (written_bytes == -1) {
+        return COSMS_CORE_FILE_FAILED_TO_WRITE;
+    }
+
+    if (bytes_written != NULL) {
+        (*bytes_written) = written_bytes;
+    }
+    #elif defined(_WIN32)
+    if (WriteFile(file->native_file, buffer, bytes_to_write, (LPDWORD)bytes_written, NULL) == 0) {
+        return COSMS_CORE_FILE_FAILED_TO_WRITE;
+    }
+    #endif
+    
+    return COSMS_CORE_FILE_OK;
+}
+
+CosmsCoreFileError cosms_core_file_write_all(struct cosms_core_file *file, char *buffer, unsigned long long bytes_to_write) {
+    if ((file->mode & COSMS_CORE_FILE_MODE_WRITE) == 0) {
+        return COSMS_CORE_FILE_INVALID_OPERATION;
+    }
+
+    #if defined(__GNUC__)
+    unsigned long long remaining_bytes = bytes_to_write;
+    while (remaining_bytes != 0) {
+        unsigned int current_bytes_to_write;
+        if (remaining_bytes > UINT_MAX) {
+            current_bytes_to_write = UINT_MAX;
+        } else {
+            current_bytes_to_write = (unsigned int)remaining_bytes;
+        }
+
+        int written_bytes = write(file, content + (bytes_to_write - remaining_bytes), current_bytes_to_write);
+        if (written_bytes == -1) {
+            return COSMS_CORE_FILE_FAILED_TO_WRITE;
+        }
+
+        remaining_bytes -= written_bytes;
+    }
+    #elif defined(_WIN32)
+    unsigned long long remaining_bytes = bytes_to_write;
+    while (remaining_bytes != 0) {
+        DWORD current_bytes_to_write, written_bytes;
+        if (remaining_bytes > UINT_MAX) {
+            current_bytes_to_write = UINT_MAX;
+        } else {
+            current_bytes_to_write = (DWORD)remaining_bytes;
+        }
+
+        if (WriteFile(file, buffer + (bytes_to_write - remaining_bytes), current_bytes_to_write, &written_bytes, NULL) == 0) {
+            return COSMS_CORE_FILE_FAILED_TO_WRITE;
+        }
+
+        remaining_bytes -= written_bytes;
+    }
+    #endif
+    
+    return COSMS_CORE_FILE_OK;
+}
+
+CosmsCoreFileError cosms_core_file_delete(const char *path) {
+    #if defined(__GNUC__)
+    if (unlink(path) == -1) {
+        switch (errno) {
+            case ENOENT:
+                return COSMS_CORE_FILE_NOT_FOUND;
+
+            case EACCES:
+                return COSMS_CORE_FILE_NO_ACCESS;
+
+            case EBUSY:
+                return COSMS_CORE_FILE_STILL_OPEN;
+
+            default:
+                return COSMS_CORE_FILE_UNKOWN_ERROR;
+        }
+    }
+    #elif defined(_WIN32)
+    if (!DeleteFile(path)) {
+        switch(GetLastError()) {
+            case ERROR_FILE_NOT_FOUND:
+            case ERROR_PATH_NOT_FOUND:
+                return COSMS_CORE_FILE_NOT_FOUND;
+
+            case ERROR_ACCESS_DENIED:
+                return COSMS_CORE_FILE_NO_ACCESS;
+
+            case ERROR_LOCK_VIOLATION:
+            case ERROR_SHARING_VIOLATION:
+                return COSMS_CORE_FILE_STILL_OPEN;
+
+            default:
+                return COSMS_CORE_FILE_UNKOWN_ERROR;
+        }
+    }
+    #endif
+
+    return COSMS_CORE_FILE_OK;
+}
+
+const char *cosms_core_file_error_string(CosmsCoreFileError error) {
+    switch(error) {
+        case COSMS_CORE_FILE_OK:
+            return "cosms-file everything ok";
+
+        case COSMS_CORE_FILE_NOT_FOUND:
+            return "cosms-file path not found";
+
+        case COSMS_CORE_FILE_NO_ACCESS:
+            return "cosms-file no access";
+
+        case COSMS_CORE_FILE_LIMIT_REACHED:
+            return "cosms-file to many open files";
+
+        case COSMS_CORE_FILE_COULD_NOT_READ_SIZE:
+            return "cosms-file failed to read size";
+
+        case COSMS_CORE_FILE_UNKOWN_ERROR:
+            return "cosms-file unkown error occured";
+
+        case COSMS_CORE_FILE_FAILED_TO_ALLOCATE:
+            return "cosms-file failed to allocate memory";
+
+        case COSMS_CORE_FILE_FAILED_TO_READ:
+            return "cosms-file failed to read content of file";
+
+        case COSMS_CORE_FILE_FAILED_TO_WRITE:
+            return "cosms-file failed to write content to file";
+
+        case COSMS_CORE_FILE_STILL_OPEN:
+            return "cosms-file still open";
+
+        case COSMS_CORE_FILE_INVALID_FILE:
+            return "cosms-file invalid native file given";
+
+        case COSMS_CORE_FILE_INVALID_OPERATION:
+            return "cosms-file invalid operation for current file";
+
+        default:
+            return NULL;
+    }
 }

tests/data/small-file.txt

@@ -0,0 +1 @@
+Hello, World!

tests/main.c

@@ -1,6 +1,14 @@
-#include <cosms-core/file.h>
+/*
+ * Copyright (C) Tristan Franssen, <tristanfranssen@strawhats.nl>.
+ *
+ * This software is licensed under the Apache License, Version 2.0 (the "License");
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License in the file LICENSE or at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ */
+#include "unit/unit.h"
 
 int main(void) {
-	cosms_core_file_read("test.txt");
+    COSMS_CORE_TEST_RUN()
 	return 0;
 }

tests/test.h

@@ -0,0 +1,43 @@
+#ifndef COSMS_CORE_TEST
+#define COSMS_CORE_TEST
+
+#include <stdio.h>
+#include <stdbool.h>
+
+#define COSMS_CORE_TEST_FUNCTION_NAME(name) cosms_core_##name##_test
+#define COSMS_CORE_TEST_DEFINE(name) void cosms_core_##name##_test(void)
+
+#define COSMS_CORE_TEST_TEST(name, implementation) void cosms_core_##name##_test(void) {                        \
+    printf("----------------------------------------\n%s\n----------------------------------------\n", #name);  \
+    implementation                                                                                              \
+}
+
+#define COSMS_CORE_TEST_SUB_TEST(name, implementation) {                                        \
+    const char *cosms_core_test_sub_test_error = NULL;                                          \
+    printf("[*] running test %s...\n", #name);                                                  \
+    implementation                                                                              \
+    if (cosms_core_test_sub_test_error == NULL) {                                               \
+        printf("[+] test %s completed successfully!\n", #name);                                 \
+    } else {                                                                                    \
+        printf("[-] test %s failed with error: %s\n", #name, cosms_core_test_sub_test_error);   \
+    }                                                                                           \
+}
+
+#define COSMS_CORE_TEST_EXPORT(name, ...) static const cosms_core_test cosms_core_test_##name[] = {   \
+        __VA_ARGS__                                                                                   \
+    }
+
+#define COSMS_CORE_TEST_START static const cosms_core_test *cosms_core_test_tests[] = {
+#define COSMS_CORE_TEST_IMPORT(name) cosms_core_test_##name
+#define COSMS_CORE_TEST_END };
+
+#define COSMS_CORE_TEST_RUN()                                                                                           \
+    for (unsigned long long index = 0; index < sizeof(cosms_core_test_tests); index += 1) {                             \
+        for (unsigned long long test_index = 0; test_index < sizeof(cosms_core_test_tests[index]); test_index += 1) {   \
+            cosms_core_test_tests[index][test_index]();                                                                 \
+        }                                                                                                               \
+    }
+
+typedef void (*cosms_core_test)();
+
+#endif

tests/unit/file.c

@@ -0,0 +1,230 @@
+/*
+ * Copyright (C) Tristan Franssen, <tristanfranssen@strawhats.nl>.
+ *
+ * This software is licensed under the Apache License, Version 2.0 (the "License");
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License in the file LICENSE or at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ */
+#include "unit/file.h"
+
+#include <cosms-core/file.h>
+
+#include <string.h>
+#include <stdlib.h>
+
+COSMS_CORE_TEST_TEST(file_open,
+    COSMS_CORE_TEST_SUB_TEST(opening small file for reading,
+        struct cosms_core_file file;
+        CosmsCoreFileError error = cosms_core_file_open(&file, "tests/data/small-file.txt", COSMS_CORE_FILE_MODE_READ);
+        if (error != COSMS_CORE_FILE_OK) {
+            cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+        } else {
+            error = cosms_core_file_close(&file);
+            if (error != COSMS_CORE_FILE_OK) {
+                cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+            }
+        }
+    )
+
+    COSMS_CORE_TEST_SUB_TEST(opening large file for reading,
+        struct cosms_core_file file;
+        CosmsCoreFileError error = cosms_core_file_open(&file, "tests/data/large-file.txt", COSMS_CORE_FILE_MODE_READ);
+        if (error != COSMS_CORE_FILE_OK) {
+            cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+        } else {
+            error = cosms_core_file_close(&file);
+            if (error != COSMS_CORE_FILE_OK) {
+                cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+            }
+        }
+    )
+
+    COSMS_CORE_TEST_SUB_TEST(opening small file for writting,
+        struct cosms_core_file file;
+        CosmsCoreFileError error = cosms_core_file_open(&file, "tests/data/small-file.txt", COSMS_CORE_FILE_MODE_WRITE);
+        if (error != COSMS_CORE_FILE_OK) {
+            cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+        } else {
+            error = cosms_core_file_close(&file);
+            if (error != COSMS_CORE_FILE_OK) {
+                cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+            }
+        }
+    )
+
+    COSMS_CORE_TEST_SUB_TEST(opening large file for writting,
+        struct cosms_core_file file;
+        CosmsCoreFileError error = cosms_core_file_open(&file, "tests/data/large-file.txt", COSMS_CORE_FILE_MODE_WRITE);
+        if (error != COSMS_CORE_FILE_OK) {
+            cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+        } else {
+            error = cosms_core_file_close(&file);
+            if (error != COSMS_CORE_FILE_OK) {
+                cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+            }
+        }
+    )
+
+    COSMS_CORE_TEST_SUB_TEST(opening small file for appending,
+        struct cosms_core_file file;
+        CosmsCoreFileError error = cosms_core_file_open(&file, "tests/data/small-file.txt", COSMS_CORE_FILE_MODE_APPEND);
+        if (error != COSMS_CORE_FILE_OK) {
+            cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+        } else {
+            error = cosms_core_file_close(&file);
+            if (error != COSMS_CORE_FILE_OK) {
+                cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+            }
+        }
+    )
+
+    COSMS_CORE_TEST_SUB_TEST(opening large file for appending,
+        struct cosms_core_file file;
+        CosmsCoreFileError error = cosms_core_file_open(&file, "tests/data/large-file.txt", COSMS_CORE_FILE_MODE_APPEND);
+        if (error != COSMS_CORE_FILE_OK) {
+            cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+        } else {
+            error = cosms_core_file_close(&file);
+            if (error != COSMS_CORE_FILE_OK) {
+                cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+            }
+        }
+    )
+
+    COSMS_CORE_TEST_SUB_TEST(opening small file for reading and writting,
+        struct cosms_core_file file;
+        CosmsCoreFileError error = cosms_core_file_open(&file, "tests/data/small-file.txt", COSMS_CORE_FILE_MODE_READ | COSMS_CORE_FILE_MODE_WRITE);
+        if (error != COSMS_CORE_FILE_OK) {
+            cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+        } else {
+            error = cosms_core_file_close(&file);
+            if (error != COSMS_CORE_FILE_OK) {
+                cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+            }
+        }
+    )
+
+    COSMS_CORE_TEST_SUB_TEST(opening large file for reading and writting,
+        struct cosms_core_file file;
+        CosmsCoreFileError error = cosms_core_file_open(&file, "tests/data/large-file.txt", COSMS_CORE_FILE_MODE_READ | COSMS_CORE_FILE_MODE_WRITE);
+        if (error != COSMS_CORE_FILE_OK) {
+            cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+        } else {
+            error = cosms_core_file_close(&file);
+            if (error != COSMS_CORE_FILE_OK) {
+                cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+            }
+        }
+    )
+
+    COSMS_CORE_TEST_SUB_TEST(opening non-existing file for reading,
+        struct cosms_core_file file;
+        CosmsCoreFileError error = cosms_core_file_open(&file, "non-existing-file.cosms", COSMS_CORE_FILE_MODE_READ);
+        if (error != COSMS_CORE_FILE_NOT_FOUND) {
+            cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+            if (error == COSMS_CORE_FILE_OK) {
+                error = cosms_core_file_close(&file);
+                if (error != COSMS_CORE_FILE_OK) {
+                    cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+                }
+            }
+        }
+    )
+)
+
+COSMS_CORE_TEST_TEST(file_close,
+    COSMS_CORE_TEST_SUB_TEST(closing file,
+        struct cosms_core_file file;
+        CosmsCoreFileError error = cosms_core_file_open(&file, "tests/data/small-file.txt", COSMS_CORE_FILE_MODE_READ);
+        if (error != COSMS_CORE_FILE_OK) {
+            cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+        } else {
+            error = cosms_core_file_close(&file);
+            if (error != COSMS_CORE_FILE_OK) {
+                cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+            }
+        }
+    )
+
+    COSMS_CORE_TEST_SUB_TEST(closing non-existing file,
+        struct cosms_core_file file;
+        file.native_file = 0;
+
+        CosmsCoreFileError error = cosms_core_file_close(&file);
+        if (error != COSMS_CORE_FILE_INVALID_FILE) {
+            cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+        }
+    )
+)
+
+COSMS_CORE_TEST_TEST(file_size,
+    COSMS_CORE_TEST_SUB_TEST(reading small file size, 
+        struct cosms_core_file file;
+        CosmsCoreFileError error = cosms_core_file_open(&file, "tests/data/small-file.txt", COSMS_CORE_FILE_MODE_READ);
+        if (error != COSMS_CORE_FILE_OK) {
+            cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+        } else {
+            unsigned long long size = 0;
+            error = cosms_core_file_get_size(&file, &size);
+            if (error != COSMS_CORE_FILE_OK) {
+                cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+            } else {
+                if (size != 13) {
+                    cosms_core_test_sub_test_error = "result does not match expected result";
+                }
+            }
+
+            error = cosms_core_file_close(&file);
+            if (error != COSMS_CORE_FILE_OK) {
+                cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+            }
+        }
+    )
+
+    COSMS_CORE_TEST_SUB_TEST(reading large file size, 
+        struct cosms_core_file file;
+        CosmsCoreFileError error = cosms_core_file_open(&file, "tests/data/large-file.txt", COSMS_CORE_FILE_MODE_READ);
+        if (error != COSMS_CORE_FILE_OK) {
+            cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+        } else {
+            unsigned long long size = 0;
+            error = cosms_core_file_get_size(&file, &size);
+            if (error != COSMS_CORE_FILE_OK) {
+                cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+            } else {
+                if (size != 5242880000ULL) {
+                    cosms_core_test_sub_test_error = "result does not match expected result";
+                }
+            }
+
+            error = cosms_core_file_close(&file);
+            if (error != COSMS_CORE_FILE_OK) {
+                cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+            }
+        }
+    )
+
+    COSMS_CORE_TEST_SUB_TEST(reading non-existing file size, 
+        struct cosms_core_file file;
+        file.native_file = 0;
+        
+        unsigned long long size = 0;
+        CosmsCoreFileError error = cosms_core_file_get_size(&file, &size);
+        if (error != COSMS_CORE_FILE_INVALID_FILE) {
+            cosms_core_test_sub_test_error = cosms_core_file_error_string(error);
+        }
+    )
+)
+
+COSMS_CORE_TEST_TEST(file_read, 
+    
+)
+
+COSMS_CORE_TEST_TEST(file_write,
+    
+)
+
+COSMS_CORE_TEST_TEST(file_delete,
+    
+)

tests/unit/file.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) Tristan Franssen, <tristanfranssen@strawhats.nl>.
+ *
+ * This software is licensed under the Apache License, Version 2.0 (the "License");
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License in the file LICENSE or at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ */
+#ifndef COSMS_CORE_FILE_TEST
+#define COSMS_CORE_FILE_TEST
+
+#include "test.h"
+
+COSMS_CORE_TEST_DEFINE(file_open);
+COSMS_CORE_TEST_DEFINE(file_close);
+COSMS_CORE_TEST_DEFINE(file_size);
+COSMS_CORE_TEST_DEFINE(file_read);
+COSMS_CORE_TEST_DEFINE(file_write);
+COSMS_CORE_TEST_DEFINE(file_delete);
+
+COSMS_CORE_TEST_EXPORT(file, 
+    COSMS_CORE_TEST_FUNCTION_NAME(file_open),
+    COSMS_CORE_TEST_FUNCTION_NAME(file_close),
+    COSMS_CORE_TEST_FUNCTION_NAME(file_size),
+    COSMS_CORE_TEST_FUNCTION_NAME(file_read),
+    COSMS_CORE_TEST_FUNCTION_NAME(file_write),
+    COSMS_CORE_TEST_FUNCTION_NAME(file_delete)
+);
+
+#endif

tests/unit/unit.h

@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) Tristan Franssen, <tristanfranssen@strawhats.nl>.
+ *
+ * This software is licensed under the Apache License, Version 2.0 (the "License");
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License in the file LICENSE or at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ */
+#ifndef COSMS_UNIT
+#define COSMS_UNIT
+
+#include "test.h"
+#include "file.h"
+
+COSMS_CORE_TEST_START
+    COSMS_CORE_TEST_IMPORT(file)
+COSMS_CORE_TEST_END
+
+#endif